Module datafusion::optimizer::utils

Collection of utility functions that are leveraged by the query optimizer rules

Functions

expr_sub_expressions	Returns all direct children Expressions of expr. E.g. if the expression is "(a + 1) + 1", it returns ["a + 1", "1"] (as Expr objects)
expr_to_column_names	Recursively walk an expression tree, collecting the unique set of column names referenced in the expression
expressions	returns all expressions (non-recursively) in the current logical plan node.
exprlist_to_column_names	Recursively walk a list of expression trees, collecting the unique set of column names referenced in the expression
from_plan	Returns a new logical plan based on the original one with inputs and expressions replaced
inputs	returns all inputs in the logical plan
optimize_explain	Create a LogicalPlan::Explain node by running optimizer on the input plan and capturing the resulting plan string
rewrite_expression	returns a new expression where the expressions in expr are replaced by the ones in expressions. This is used in conjunction with expr_expressions to re-write expressions.